From: "Amir G." Subject: Re: [PATCH v1 00/30] Ext4 snapshots Date: Sat, 11 Jun 2011 04:09:27 +0300 Message-ID: References: <1307459283-22130-1-git-send-email-amir73il@users.sourceforge.net> <52699.1307746288@turing-police.cc.vt.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Lukas Czerner , Yongqiang Yang , linux-ext4@vger.kernel.org, tytso@mit.edu, linux-kernel@vger.kernel.org, sandeen@redhat.com To: Valdis.Kletnieks@vt.edu Return-path: Received: from mail-wy0-f174.google.com ([74.125.82.174]:38234 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758354Ab1FKBJ3 convert rfc822-to-8bit (ORCPT ); Fri, 10 Jun 2011 21:09:29 -0400 In-Reply-To: <52699.1307746288@turing-police.cc.vt.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Sat, Jun 11, 2011 at 1:51 AM, wrote: > On Thu, 09 Jun 2011 13:54:13 +0300, "Amir G." said: > >> Why do you keep saying 'backup only'? >> There is a huge difference between having long lived snapshots, >> like CTERA products have, and temporary snapshot for backup >> purpose (for which LVM is adequate). > > I must have blinked somewhere - I'm not convinced LVM is even "adequa= te" for > backup purposes. =A0In particular, how does an LVM-level snapshot dea= l with the > "metadata in memory" problem (basically the exact same problem as run= ning fsck > on a disk partition that is already mounted)? > > It uses the filesystem freeze API. Same as ext4 snapshots. Amir. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html